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p is a Shared_ptr, but nothing at all about its sharedness is applied here and passing it by worth is often a silent pessimization;

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This is able to carry a cost only once the assertion examining was enabled and would provide a compiler/analyzer beneficial facts.

We wish to really encourage best tactics, rather than leave all to personal possibilities and administration pressures.

Such as, looking through clock two times will often generate two diverse values, so the optimizer experienced superior not optimize away the 2nd examine In this particular code:

R.36: Take a const shared_ptr& parameter to express that it would retain a reference count to the article ???

† swap throwing: It truly is commonly doable to reliably swap information members which the objects observe by pointer, but non-pointer details associates that don't have a throw-cost-free swap, or for which swapping needs to be executed as X tmp = lhs; lhs = rhs; rhs = tmp; and replica-building or assignment may well throw, however have the opportunity to fail leaving some details customers swapped and Many others not. This potential applies even to C++03 std::string's as James responses on One more solution:

By stating the intent in resource, implementers and tools can offer superior diagnostics, for example discovering some classes of mistakes by way of static Examination, and complete optimizations, such as taking away branches and null tests.